We found one dictionary that defines the word blowing ups:

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1. blowing ups: Collins English Dictionary

(Note: See blowing_up as well.)

Definitions from Wiktionary (blowing up) ▸ noun:  (colloquial) Explosion. ▸ Also see blowing_up ▸ Words similar to blowing ups ▸ Usage examples for blowing ups ▸ Idioms related to blowing ups ▸ Wikipedia articles (New!) ▸ Words that often appear near blowing ups ▸ Rhymes of blowing ups ▸ Invented words related to blowing ups